Hand Tools Archive

Subject:
Re: Cap iron question-need data

Bill Tindall
The clearance angle in Kato's work was 10 degrees. But, a flat develops on the bevel face(back face) that renders the clearance angle zero as the blade wears. This development has a profound effect on the mechanics of the balde. As soon as this flat develops the forces on the blade perpendicular to the planed surface go from pulling the blade into the board to pushing away. I'll bet this change is something that can be felt when hand planing.

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